You must ensure the security of ballot papers during production, delivery and storage. Once the official mark is printed on the ballot papers, they are effectively live.
Regardless of whether you have outsourced your printing or are printing in-house, in order to ensure that voters can have confidence in the process, your security arrangements should prevent unauthorised access to or use of the ballot papers.
These restrictions should apply during all stages of the production process and storage between printing and the poll.