MPEG-4 release standards are set in the so-called TDX rules. The DivX codec originally gained popularity because it provided a good compromise between film quality and file size. Approximately 25% of the space occupied by DVD is enough for a DivX encode to have DVD quality output. The first standards were created by meetings and debates of Team DivX (TDX) in 2000. This group consisted of the leaders of the top 5 DivX releasing groups, topsite operators along with rippers and encoders. It was formed because they thought "the new Div/X scene was a bit unmoderated, sloppy and pretty much a free-for-all." iSONEWS published the first standards on April 26. Earlier, on March 16, the database started to carry a DivX section on their website. A week later Betanews noticed the popularity of the then recently released DivX codec throughout IRC channels and asked whether this was a new threat to DVD after the DeCSS utility. The 2001 revision of the standards were organized by different people from iSONEWS. It consisted of 15 groups and signed by 18. This was the last one of the listed rulesets covering pornography.