Date stamped protection on recent films?

I occasionally download films using bittorrents. I have noticed that
some of them (and I think it seems to be Avi's) worked fine at first
then after a few weeks stopped loading into Win Media player. They
appear to freeze at the start and usually crash the player. Films
downloaded a couple of years ago still work fine. Why would this be
and anybody any theories and or cure? Could the more recent films -
late 2007 onwards have a self destruct protection in them when they
are more than a few weeks old?

"Pete L" <peterlavington@hotmail.com> wrote in message
news:6f61c79b-5d52-4243-924d-106207df0aa5@p25g2000hsf.googlegroups.com...
>I occasionally download films using bittorrents. I have noticed that
> some of them (and I think it seems to be Avi's) worked fine at first
> then after a few weeks stopped loading into Win Media player. They
> appear to freeze at the start and usually crash the player. Films
> downloaded a couple of years ago still work fine. Why would this be
> and anybody any theories and or cure? Could the more recent films -
> late 2007 onwards have a self destruct protection in them when they
> are more than a few weeks old?

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I just buy the movies on DVD and they work great!