Red dot appears on ImageResizer in asp.net

Question

I am using imageresizer, however there's a red dot on the image, although i am not using any paid plugin, below are the plugin i am using:

1. ImageResizer.dll
2. DiskCache.dll
3. PrettyGifs.dll

below is my querystring with the image:

image.jpg?w=100&h=50&mode=crop

Although i tried without crop as well and the results are still same. I checked debug.ashx and it says i am using Performance Edition plugins, however i don't have any plugins except above. It also mentions

You are using <licenses licenseError='Watermark'>. If there is a licensing error, an red dot will be drawn on the bottom-right corner of each image. This can be set to 'Exception' instead (valuable if you are storing results).

Can anyone suggest, why the red dot is appearing.

Answer 1

DiskCache and PrettyGifs are both paid plugins (unless you're AGPL-compliant).

Disk caching is quite important for production sites, since they can be easily overwhelmed if results aren't cached. Image processing takes significant CPU time and RAM.

If you're doing a new project, you should use Imageflow instead of ImageResizer, as it's the newer, better replacement: https://github.com/imazen/imageflow-dotnet-server