What is the difference between trial version and full version!

Sometimes, the new customers asked me about the difference between trial version and full version of the series of DVD and Video tools.
It is common in the following three situations:
1.A watermark on the output file
2.Time limitation
3.Function limitation

BTW, i suggest that you should better download the trial version and have a try to see whether it fits your demand. So many similar tools in the market, you can download several from different company to make a compare and choose the most appropriate one.