Spark is exploring new ways to deliver video entertainment to customers, but Lightbox's chief executive says it won't be affecting their product.
"Lightbox will remain exactly as it is," chief executive Kym Niblock said.
Spark's half-yearly financial announcement to shareholders said the company would continue to invest in media, and would move towards an open platform approach for video content.
Niblock said Lightbox was "going gangbusters" and would continue to buy content.
Spark managing director Simon Moutter said the company would be fine-tuning the content being bought.