Preface: The question is a bit complicated as it revolves around issues that were not present at every time and in every area, like
- Direct protection by different interfaces
- Direct protection by encryption
- Direct protection with region locking
- Indirect protection due video standards
- Sales restrictions
Similar the the distinction 'the West' isn't really useful. What constructs 'the West' ? Is Brasil part of it? Or Yugoslavia? Or South Africa? Cold war propaganda terms aren't as useful in a serious setting as one may think at first. The 'West' is way more diverse than that.
So while I think the question as such can not be answered in a serious manner, I think it may be useful to add some personal views over the years - as IT professional and gamer who was never big into consoles, but spend way too many hours playing on my Apple/Atari/PC.
In general, the most relevant point here is that on the computer side there was never a concept of regional locking or separated markets, like it was on consoles - and ever there it took time to evolve.
Of course did NTSC games for the Atari VCS not work on a PAL unit straight away. Or better, they did, as the console didn't care, but a strict 50 Hz PAL TV's would not display the generated 60 Hz PAL picture (*1) . But that was only a minor hurdle, as already in the late 70s TV sets (at least many German produced) were able to synchronize at 60 Hz as well (*2). They were made for export and build to carter to many standards and combinations thereof. If at all, one had to get a second decoder module for the TV, which were easy available.
Early Computer Games - ca. 1980
For machines that did essentially not differ between markets, like the Apple II, or Commodore PET / TRS-80 due bringing their own display, the issue wasn't copy protection or sales hurdles - foreign manufacturers were eager to sell to Germany - but taxation. I remember when I once tried to bring a bunch of brand new Apple II games in from the US. Must have been 1979 or 1980, so really the beginning of commercial computer games. They twice across the pond until we figured out how to do it. There was simply no import duty category for software at that time. So we finally settled on them as being promotional items without commercial value - which required them to have it clearly marked, so they got returned, someone in California put a stamp on each disk cover 'DEMO' and send it again over. This time flawless. I still have the covers :))
Fun part aside, at the time the second mailing arrived I already had most of these games as pirated copies ... Yes, pirating has always been faster, even way before the Internet.
8 Bit World
Now, there were also machines that differed between markets, most notably the C64 with it's ~4% lowered clock rate for European models (0.985 MHz vs. 1.023 MHz). But again, like with the 2600, most (early) games simply worked. Maybe a bit slowed down when counting frames for speed effects. Later, when games got more sophisticated, using raster effects and alike some did show glitches
With the C64 the problems were more prevalent when using a PAL game on a NTSC machine due having less border space and equally faster action. But again, a large number of games simply worked.
In general the same issue happens with the Atari 8 bit series. Due it'S way more powerful graphics system games used many effects already early on, creating incompatibility. Here again the use of NTSC games in a PAL system results in (usually) less glitches than the other way around. Again most based on the higher resolution offered by PAL due the lower frame rate.
Of course, machines that were mostly sold in Europe didn't had anyone outside suffering, like the ZX80/81/Spectrum series. Similar the Amstrad CPC avoided it by using their own displays (*3)
When it comes to Japanese computers, their market was rather limited in Europe. Sharp did make some good sales with the MZ-80 series, but they again not only more business orientated, but as well all in one units, so compatibility was a given thing.
The Brave New 16 Bit World
For the Atari ST, software is mostly agnostic of the frame rate and modulation (with the *m models) is done according to either standard. Again, top end games (like XENON) may or may not work on either frame rate. Resolution is, unlike with previous generation, less of an issue and stable per mode. Also, most users didn't use a TV set at all, but dedicated CRTs (*4). In general software companies did take this into account and made single versions for all markets.
For the Amiga it was a bit more complicated and simple at the same time. Machines could be switched by hardware modification between both video standards, or, units with 1 MiB chipram, could do so in software. With AmigaDOS 3 and higher the mode could be set with a key combination during start up. In the end it came again to each game if it did run in either or both modes.
Finally the PC
With the PC all of this became obsolete and hardware differences vanished. Not only due displays independent of TV standards, but as well due software layers like DirecX.
In fact, why should a manufacturer restrict sales at all? The whole idea of regions and locking is more that of console manufacturers trying to control market access. With the PC there is no single manufacturer guarding the machine but independent developers of hardware and software - and the later do have an interest to sell as many as possible.
If any manufacturer wanted to restrict access at all, it became a complicated game of guessing, as neither Windows version not IP addresses or any setting does really reflect where the PC or its user is located. Even more, all of that are software settings.
Long Story Short
On computers regional/market locking was never a real thing, more of an anoyance to be overcome.
*1 - Even with a US game the output would still be PAL encoded, but 60 Hz and 525 lines.
*2 - Heck, even the old (late 1960s) B&W TV I had in my room could show US-TV from a nearby base (with some fiddling of an 8 year old). Only for the sound I had to ask for help.
*3 - There was a Power/TV Modulator unit available, at least from Schneider, but I'm not sure if many were sold.
*4 - In fact, the TV-ready models did only come rather late, when Atari tried to expand downwards to low end users - mostly in the US, as the ST was considered more of a professional computer in Europe.