A: Yes. If the file is an MP4 and under 100MB (or optimized for streaming), the Google Drive web player will open it. For larger files, the user may need to download the Google Drive app or the file itself.
A: Generally, no. Most consumer DVDs have licensing agreements that forbid public performance or distribution. Sharing the link with a few family members is a grey area; posting it on the internet is definitely illegal.
A: You can store individual files up to 5 TB, but for streaming, keep files under 10 GB and under 3 hours in length for the best results.