http://e26whn2524322mkxb3cbyk27ev2ihhq2biz35hty7gzgsyrwrygq27yd.onion/posts/blog/opinion/drm-is-evil.html
If you are physically in a shop, check the case for the CD logo, Phillips will not allow any DRM on the registered CD format, so if this logo is there you are likely to be safe. If you are online shopping then check the description, they are not allowed to call it an audio cd if it contains DRM.