Sarafan: Does it require the DVD in your drive while playing? If so, it's a form of DRM. :) I find it more irritating than a client requirement to be honest. Usually it takes more time to get the box, pull the DVD out of it, place it into the drive and wait until it starts. Nothing beats a true DRM-free version however. :)
I forgot in what thread we've talked about this but just now randomly stumbled upon it again so here goes.
The box is Tomb Raider: Ultimate Collection, distributed by Cenega (a Czech game distribution company). This version was only ever sold in Europe and most likely only in the V4 countries (Czech Republic, Slovakia, Poland, Hungary for those who don't know).
Here is a picture of the box. It contains everything, including the pretty rare Lost Artifact for TR3.
Everything plays without the disc in the drive. Tried TR 1, 2, 3 and 4.
Currently playing TR3. Will supply a screenshot later to stay on topic :P
EDIT: Added a screenshot