Hi @[deleted],
Yes, you can. NCH offers three types of licenses for this software:
1) Pixillion Image Format Converter Premium Edition - The "Premium" registration gives you a full features license to use a single installation of Pixillion Plus including text captioning, watermarking and the ability to convert more than one image at a time.
2) Pixillion Image Format Converter Standard Edition - The "Standard" registration also gives you access to all support file formats and batch converting but without added effects including watermarking photos.
Both licenses are lifetime licenses and can not expire.