Version 2.5 of the software further extended the offering allowing up to 100 video participants in one conference. The company has since expanded its offer to include meetings with up to 500 video participants. Zoom relies on client-side encryption using the Advanced Encryption Standard 256-bit (AES 256) algorithm for presentation content.[39][40] As of October 2015, the lower limit of 25 participants in video meetings has been increased to 100.[41][42] Between 2015 and mid-2016, Zoom Video Communications announced native support for Skype for Business and integration with Slack.[43][44]